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Synthetic graphite material, synthetic graphite material production method, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

A technology of artificial graphite and manufacturing method, applied in the direction of secondary battery, battery electrode, graphite, etc., can solve the problems of capacity deterioration, poor charging and discharging efficiency of positive electrode and negative electrode, etc., and achieve the effect that the discharge capacity is difficult to deteriorate

Pending Publication Date: 2021-08-24
JXTJ NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As has been reported, in the state where lithium metal is not precipitated at the negative electrode, capacity deterioration progresses due to the difference in charge-discharge efficiency between the positive electrode and the negative electrode (for example, refer to Non-Patent Documents 1 and 2

Method used

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  • Synthetic graphite material, synthetic graphite material production method, negative electrode for lithium ion secondary battery, and lithium ion secondary battery
  • Synthetic graphite material, synthetic graphite material production method, negative electrode for lithium ion secondary battery, and lithium ion secondary battery
  • Synthetic graphite material, synthetic graphite material production method, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

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Experimental program
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Embodiment 1

[0188] For desulfurized vacuum light oil (sulfur content 500 mass ppm, density at 15°C 0.88g / cm 3 ) was subjected to fluid catalytic cracking to obtain a fluid catalytic cracking residue (hereinafter referred to as "fluid catalytic cracking residue (A)"). The obtained fluid catalytic cracking residue (A) had an initial boiling point of 220°C, a sulfur content of 0.2% by mass, and an aromatic content of 60% by mass. In addition, hydrodesulfurization was performed on an atmospheric distillation residue with a sulfur content of 3.5% by mass in the presence of a Ni-Mo catalyst so that the hydrolysis rate became 30% or less, and a hydrodesulfurized oil (hereinafter referred to as as "hydrodesulfurized oil (A)".). The obtained hydrodesulfurized oil (A) had an initial boiling point of 260°C, a sulfur content of 0.3% by mass, an asphaltene content of 1% by mass, a saturated content of 70% by mass, and a density of 0.92 g / cm at 15°C. 3 .

[0189] Next, desulfurized vacuum light oil ...

Embodiment 2

[0203]The feed oil composition was obtained by mixing desulfurized fluid catalytic cracking residue (B-1), fluid catalytic cracking residue (A) and hydrodesulfurized oil (A) at a mass ratio of 15:65:20. This raw material oil composition was put into a test tube, and heat-treated at normal pressure and 500 degreeC for 3 hours, and coking was performed, and the raw material coke composition was obtained. This raw coke composition was pulverized by a hammer mill so that the average particle diameter measured by a laser diffraction particle size distribution analyzer was 18.8 μm. The obtained pulverized product was fired at 1000° C. under a nitrogen gas flow to obtain calcined coke. At this time, the heating time from room temperature to 1000°C is set to 4 hours, the holding time at 1000°C is set to 4 hours, and the cooling time from 1000°C to 410°C is set to 2 hours. Let cool on the air side for 4 hours. The obtained calcined coke was put into a graphite crucible, and graphitiz...

Embodiment 3

[0205] The feedstock oil composition was obtained by mixing desulfurized fluid catalytic cracking residue (B-1), fluid catalytic cracking residue (A) and hydrodesulfurized oil (A) at a mass ratio of 40:40:20. This raw material oil composition was put into a test tube, and heat-treated at normal pressure and 500 degreeC for 3 hours, and coking was performed, and the raw material coke composition was obtained. This raw coke composition was pulverized with a hammer mill so that the average particle diameter measured by a laser diffraction particle size distribution analyzer became 20.5 μm. The obtained pulverized product was fired at 1000° C. under a nitrogen gas flow to obtain calcined coke. At this time, the heating time from room temperature to 1000°C is set to 4 hours, the holding time at 1000°C is set to 4 hours, and the cooling time from 1000°C to 410°C is set to 2 hours. Let cool on the air side for 4 hours. The obtained calcined coke was put into a graphite crucible, an...

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Abstract

A synthetic graphite material wherein the crystal grain size L(112) in the c-axis direction as calculated from a (112) diffraction line obtained by wide-angle X-ray diffraction is 4-30 nm, the surface area based on volume as calculated by a laser diffraction-type particle size distribution measurement device is 0.22-1.70 m2 / cm3, the oil absorption is 67-147 mL / 100g, the spectra derived from carbon that appear in an electron spin resonance method measured by using the X band is within the range 3200-3410 gauss, and [delta]Hpp, which is the spectral line width calculated from the first derivative spectra for said spectra at the temperature of 4.8 K, is 41-69 gauss.

Description

technical field [0001] The invention relates to an artificial graphite material, a manufacturing method of the artificial graphite material, a negative electrode for a lithium-ion secondary battery, and a lithium-ion secondary battery. [0002] This application claims priority based on Japanese Patent Application No. 2019-004664 for which it applied in Japan on January 15, 2019, and uses the content here. Background technique [0003] Lithium-ion secondary batteries are used in industrial applications such as automobiles and power storage for system infrastructure. [0004] Graphite, such as an artificial graphite material, is used as a negative electrode material of a lithium ion secondary battery (for example, refer patent document 1.). [0005] Batteries suitable for automotive use are used in a wide temperature range from low temperatures below 0°C to high temperatures above 60°C. However, in a lithium ion secondary battery using graphite as a negative electrode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205B01J27/19C10B57/04C10G45/08H01M4/587
CPCB01J27/19C01B32/205C10G45/08H01M4/587Y02E60/10C10B57/045C10B55/00B01J23/883H01M10/0525B01J35/19B01J35/647C10B57/04C01P2002/70C01P2006/12C01P2006/19C01B32/21C01P2004/51
Inventor 铃木贵志前田崇志唐金光雄白井崇弘川地浩史木内规之
Owner JXTJ NIPPON OIL & ENERGY CORP
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